Search results for "Inspec"
showing 10 items of 171 documents
Autonomous 3D geometry reconstruction through robot-manipulated optical sensors
2021
Abstract Many industrial sectors face increasing production demands and need to reduce costs, without compromising the quality. Whereas mass production relies on well-established protocols, small production facilities with small lot sizes struggle to update their highly changeable production at reasonable costs. The use of robotics and automation has grown significantly in recent years, but extremely versatile robotic manipulators are still not commonly used in small factories. Beside of the investments required to enable efficient and profitable use of robot technology, the efforts needed to program robots are only economically viable in case of large lot sizes. Generating robot programs f…
A novel clustering-based algorithm for solving spatially-constrained robotic task sequencing problems
2021
The robotic task sequencing problem (RTSP) appears in various forms across many industrial applications and consists of developing an optimal sequence of motions to visit a set of target points defined in a task space. Developing solutions to problems involving complex spatial constraints remains challenging due to the existence of multiple inverse kinematic solutions and the requirements for collision avoidance. So far existing studies have been limited to relaxed RTSPs involving a small number of target points and relatively uncluttered environments. When extending existing methods to problems involving greater spatial constraints and large sets of target points, they either require subst…
Dynamics of a flexible magnetic chain in a rotating magnetic field.
2004
The model of an elastic magnetic rod is applied for a study of a behavior of the flexible magnetic particle chain in a rotating magnetic field. By numerical simulation it is shown that behavior of a flexible magnetic chain is characterized by the existence of a critical frequency beyond which the dynamics of the rod is periodic with subsequent stages of bending and straightening. The value of the critical frequency found is explained by a simple model. Below the critical frequency the chain is bent and rotates synchronously with a field. It is illustrated that in particular cases the considered model reproduces phenomena observed experimentally and numerically for the magnetic particle chai…
Les inspections primaires de l'éducation nationale : dotations, pratiques et effets sur le fonctionnement des écoles et les acquis des élèves
1997
This article analyses first the variety in the characteristics of local school inspectorates both in the quantitative (number of teachers) and in the qualitative (social background and geographic dispersion) dimensions. In relation to these, the article examines tne level of endowment (staffing and material) of the inpectorates and concludes to the lack of relationship between the resources mobilized and the needs at the local level. Then the practises of the inspectors and of their teams are described and here again a wide variety does exist across the different inspectorates in the administrative, relational and pedagogical dimensions of their activity (this variety in practices shows no …
Digitization and characterization of local reflectance of complex surfaces for visual inspection
2022
Mastering the visual perception of the surfaces of manufactured products is a central issue for industry. However, in industry, the quality of surfaces is often assessed by human inspectors. Only a few specific cases use an instrumental or photometric approach. Among the photometric approaches, one of them is experiencing significant growth: Reflectance Transformation Imaging (RTI). The RTI makes it possible to obtain a reduced and simplified estimate of the Bidirectional Reflectance Distribution Function (BRDF) and an estimate of the geometry of the surface. However, this technique has limitations in terms of data acquisition and processing. The objective is therefore to correct some of th…
Extensión y modernización de la educación primaria en España. (1958-1970)
2017
El presente trabajo se centra en el estudio de la enseñanza primaria y las políticas de alfabetización en el periodo que va entre 1958, año en el que se crea el CEDODEP y 1970, año en el que se aprueba la Ley General de Educación. Para ello, en los sucesivos apartados se trabajan descriptores que tienen que ver con el funcionamiento del sistema, con el profesorado y con la mejora de la calidad que se producirá a lo largo de esta década de rápido desarrollo económico, social y también educativo. En el primero de los apartados, este estudio se centra en las políticas de alfabetización y los niveles de analfabetismo. En 1950, el nivel medio de analfabetismo era del 17%, con niveles sensiblemen…
HD-RTI: an adaptive multi-light imaging approach for the quality assessment of manufactured surfaces
2021
International audience; Reflectance Transformation Imaging (RTI) is a technique for estimating surface local angular reflectance from a set of stereo-photometric images captured with variable lighting directions. The digitization of this information fully fits into the industry 4.0 approach and makes it possible to characterize the visual properties of a surface. The proposed method, namely HD-RTI, is based on the coupling of RTI and HDR imaging techniques. This coupling is carried out adaptively according to the response at each angle of illumination. The proposed method is applied to five industrial samples which have high local variations of reflectivity because of their heterogeneity of…
Digital image analysis technique for measuring railway track defects and ballast gradation
2018
Abstract In order to guarantee safety and driving comfort and to maintain an efficient railway infrastructure, the first step is to carefully monitor the track geometry and wear level of the materials constituting the superstructure. To that end diagnostic trains are widely used on main lines, in that they can detect several geometric track parameters and rail wear, but under no circumstances they can yet detect ballast gradation. Due to the practical implications for the planning of maintenance operations on the railway network, this article presents a “DIP” digital image processing technique for measuring the transverse profile and corrugations of the rails as well as ballast gradation. T…
L'évaluation des enseignants : contexte, analyse et perspectives d'évolution
2012
Dans un contexte où l'évaluation des enseignants fait débat en France et où elle est susceptible d'évoluer vers de nouvelles modalités, ce texte propose d'analyser cette question en la situant dans une perspective globale qui associe les enjeux présents de la politique éducative aux apports de la recherche en éducation. On rappellera dans un premier temps certains apports de l'évaluation des systèmes éducatifs avant de mettre en évidence le rôle de l'enseignant comme déterminant essentiel des apprentissages des élèves. Nous nous centrerons dans un second temps sur les modalités actuelles de l'évaluation des enseignants dans notre pays et sur ses perspectives d'évolution en en dégageant les …
Evaluation of Coded Excitations for Autonomous Airborne Ultrasonic Inspection
2019
Unmanned Aerial Vehicles (UAVs) are receiving increasing attention for use in Non-Destructive Testing due to their ability to access areas where manual inspection is not practical. Contact-based UAV ultrasonic inspections grant the opportunity to remotely monitor the structural health of an industrial asset with enhanced internal integrity information. Ultrasonic inspection is a Non-Destructive Testing (NDT) method conventionally used in corrosion mapping. Surface contacting ultrasonic transducers provide enhanced structural integrity information. However, due to near-surface aerodynamic effects, angular sensitivity of the ultrasound probe and alignment error during autonomous inspections, …